Distributed clad mode sensor in unmodified standard single-mode fiber with 8 centimeters resolution

Gil Bashan; Yosef London; H. Hagai Diamandi; Avi Zadok

doi:10.1117/12.2539558

28 August 2019 Distributed clad mode sensor in unmodified standard single-mode fiber with 8 centimeters resolution

Gil Bashan, Yosef London, H. Hagai Diamandi, Avi Zadok

Proceedings Volume 11199, Seventh European Workshop on Optical Fibre Sensors; 111991T (2019) https://doi.org/10.1117/12.2539558
Event: Seventh European Workshop on Optical Fibre Sensors, 2019, Limassol, Cyprus

Abstract

A distributed clad mode optical fiber sensor is reported for the first time. Random-access coupling of light to a clad mode of a standard single-mode fiber is achieved using Brillouin dynamic gratings. Coupling is restricted to a single, few-centimeters-long section that is scanned along a fiber under test. No permanent gratings are required, and all optical fields are launched and detected in the core mode. The coupling spectrum is affected by the local refractive index of the substance outside the cladding. Distributed mapping of surrounding media is reported over 2 meters of fiber with 8 centimeters resolution. The sensitivity of outside index measurements is between 4e-4 and 4e-3 refractive index units.

Citation Download Citation

Gil Bashan, Yosef London, H. Hagai Diamandi, and Avi Zadok "Distributed clad mode sensor in unmodified standard single-mode fiber with 8 centimeters resolution", Proc. SPIE 11199, Seventh European Workshop on Optical Fibre Sensors, 111991T (28 August 2019); https://doi.org/10.1117/12.2539558

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